eBay and Open Cart Integration

We intend to sell products on eBay (in Australia only) and need a custom integration with eBay. We currently have an online store created in OpenCart version 2.0.3.1 . We need products created in Open Cart (via the admin page) to be pushed to eBay, and any sales that are made on the eBay side to be pulled back into Open Cart. It is important to have product options set correctly as we use product options to determine what items to subtract from our inventory. Product option codes vary from product to product. As an example, we may have a product: Whey Protein Concentrate, with options Chocolate with code CHOC-1, and Vanilla with code VANIL-7 then another product that uses the same options, but with different codes. i.e. Breakfast Shake with options Chocolate with code CHOC-234, and Vanilla with code VN-45 Pushing to ebay When a product is pushed to eBay from an existing Open Cart product, it will need to send the product description, price and any options, including modified price for option. Plus basics like images, etc. We must be able to select which products we sent to eBay and the ones we leave. There must also be the ability to modify a product in eBay if we modify it in open cart. Pulling order from eBay When an order is pulled from eBay it will need to pull the delivery address, and order product details, so that we can deliver the order for the customer. This delivery information must be integrated with Open Carts internal order system. Once the order is posted we will change its status in Open Cart to one of multiple posted statuses, which then must flag eBay that the product is on its way. When we post the customers’ order we get a tracking number, we would like that posted back to eBay, so the customer can see their tracking number. We would also like the ability to update the internal progress status in eBay from and OpenCart order. Orders must be restricted to Australian delivery addresses. In your quote please let us know how many months, years experience you have with eBay API. And let us know if you have worked with Open Cart ([login to view URL]).